<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>参考链接：https://codepen.io/wheatup/pen/XLmzbe</title>
</head>
<style>
  * {
    box-sizing: border-box;
    font: inherit;
  }

  html {
    overflow: hidden;
    color: #333;
    font-size: 62.5%;
  }

  @media screen and (max-width: 480px) {
    html {
      font-size: 50%;
    }
  }

  html body {
    font-size: 2rem;
    padding: 0;
    margin: 0;
    width: 100vw;
    height: 100vh;
    background-image: linear-gradient(to left bottom, #444, #222);
    overflow: hidden;
    font-family: "Rubik", sans-serif;
  }

  .Confirm {
    position: absolute;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 72rem;
    max-width: 100%;
    min-width: 34rem;
    max-height: 100%;
    height: 46rem;
    background-color: #ccc;
    border-radius: 1rem;
    box-shadow: 0px 10px 5px -3px rgba(0, 0, 0, 0.2);
  }

  .Confirm-Header {
    display: flex;
    align-items: center;
    position: relative;
    flex: 0 0 4rem;
    margin: 0 1rem;
    border-bottom: solid 1px rgba(0, 0, 0, 0.1);
    white-space: nowrap;
  }

  .Confirm-Header-Button {
    display: block;
    width: 1.6rem;
    height: 1.6rem;
    border-radius: 1rem;
    flex: 0 0 auto;
    transition: background-color 0.3s;
  }

  .Confirm-Header-Button:not(:last-of-type) {
    margin-right: 1rem;
  }

  .Confirm-Header-Button_Close {
    background-color: #a43;
  }

  .Confirm-Header-Button_Close:hover {
    background-color: #c85a48;
  }

  .Confirm-Header-Button_Maximize {
    background-color: #cb3;
  }

  .Confirm-Header-Button_Maximize:hover {
    background-color: #d6c95c;
  }

  .Confirm-Header-Button_Minimize {
    background-color: #6a4;
  }

  .Confirm-Header-Button_Minimize:hover {
    background-color: #81c061;
  }

  .Confirm-Header-Title {
    margin: 0;
    padding: 0;
    transform: translateX(50%);
    margin-right: 50%;
    margin-left: auto;
  }

  .Confirm-Body {
    flex: 1;
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    position: relative;
    margin: 2rem 4rem;
  }

  .Confirm-Body-Title {
    margin: 0;
    padding: 0;
    position: absolute;
    transform: translateY(-50%);
    top: 5%;
    text-align: center;
    width: 100%;
  }

  .Confirm-Body-Button,
  .Confirm-Body-Button:link,
  .Confirm-Body-Button:visited {
    color: #fff;
    border-radius: 1rem;
    text-decoration: none;
    padding: 1rem 2rem;
    margin-bottom: 1rem;
    min-width: 10rem;
    text-align: center;
    transition: background-color 0.3s;
  }

  .Confirm-Body-Button_Delete {
    background-color: #a43;
  }

  .Confirm-Body-Button_Delete:hover {
    background-color: #c85a48;
  }

  .Confirm-Body-Button_Cancel {
    background-color: #6a4;
  }

  .Confirm-Body-Button_Cancel:hover {
    background-color: #81c061;
  }

  .Boi {
    --happiness: 0.9;
    --derp: 1;
    --px: 0.5;
    --py: 0.5;
    width: 22rem;
    max-width: 100%;
    height: 22rem;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-image: radial-gradient(#f7e0b2, #eb5);
    border-radius: 100%;
    overflow: hidden;
    margin: 0;
    align-self: center;
    flex: 0 0 auto;
    border: solid 2px #ecb23e;
    box-shadow: 0px 0px 5px rgba(0, 0, 0, 0.2);
  }

  .Boi,
  .Boi * {
    position: absolute;
  }

  .Boi::before {
    content: "";
    display: block;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background-image: linear-gradient(to bottom, #5a8, rgba(85, 170, 136, 0));
    opacity: calc(1 - var(--happiness));
  }

  .Boi-Blush {
    width: 20%;
    height: 10%;
    background-color: rgba(255, 100, 100, 0.3);
    border: 3px solid rgba(255, 100, 100, 0.3);
    top: calc(45% + var(--py) * 10%);
    border-radius: 100%;
    opacity: calc(var(--happiness) * var(--happiness) * 0.9 + 0.1);
  }

  .Boi-Blush_L {
    left: calc(7% + var(--px) * 2%);
  }

  .Boi-Blush_R {
    right: calc(9% - var(--px) * 2%);
  }

  .Boi-Eye {
    width: calc(26% - var(--happiness) * 2%);
    height: calc(26% - var(--happiness) * 2%);
    background-color: #f6f6f6;
    border-radius: 100%;
    top: calc(25% + var(--py) * 10%);
    overflow: hidden;
  }

  .Boi-Eye_L {
    left: calc(18% + var(--px) * 4%);
  }

  .Boi-Eye_L::after {
    transform: translate(calc((var(--px) + var(--derp) * 0.5) * 100%), calc((var(--py) + var(--derp) * 0.5) * 100%));
  }

  .Boi-Eye_R {
    right: calc(22% - var(--px) * 4%);
  }

  .Boi-Eye_R::after {
    transform: translate(calc((var(--px) + var(--derp) * -0.3) * 100%), calc((var(--py) + var(--derp) * -0.3) * 100%));
  }

  .Boi-Eye::after {
    content: "";
    display: block;
    background-color: #421;
    width: calc(55% - var(--happiness) * 10%);
    height: calc(55% - var(--happiness) * 10%);
    border-radius: 100%;
  }

  .Boi-Mouth {
    width: calc(51% - var(--happiness) * 2%);
    height: calc(26% - var(--happiness) * 2%);
    background-color: #a33;
    border-radius: calc((1 - var(--happiness)) * 10em) calc((1 - var(--happiness)) * 10em) calc(var(--happiness) * 16em) calc(var(--happiness) * 16em);
    top: calc(57.5% + var(--py) * 5%);
    left: calc(47.5% + var(--px) * 5%);
    transform: translateX(-50%);
    overflow: hidden;
    border: 3px solid #962d2d;
    /* fix safari overflow breach */
    -webkit-mask-image: -webkit-radial-gradient(white, black);
    mask-image: -webkit-radial-gradient(white, black);
  }

  .Boi-Mouth::before {
    content: "";
    display: block;
    position: absolute;
    width: 20%;
    height: 20%;
    top: 0;
    left: 50%;
    background-color: white;
    border-radius: 0 0 0.5rem 0.5rem;
  }

  .Boi-Mouth::after {
    content: "";
    display: block;
    position: absolute;
    width: 60%;
    height: 50%;
    left: 10%;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 20rem 20rem 0 0;
  }
</style>

<body>
  <section class="Confirm">
    <div class="Confirm-Header">
      <a class="Confirm-Header-Button Confirm-Header-Button_Close" href="javascript: void(0)"></a>
      <a class="Confirm-Header-Button Confirm-Header-Button_Minimize" href="javascript: void(0)"></a>
      <a class="Confirm-Header-Button Confirm-Header-Button_Maximize" href="javascript: void(0)"></a>
      <h1 class="Confirm-Header-Title">Confirm uninstall</h1>
    </div>
    <div class="Confirm-Body">
      <h2 class="Confirm-Body-Title">Are you sure you want to remove Boi from your pc?</h2>
      <figure class="Boi">
        <div class="Boi-Blush Boi-Blush_L"></div>
        <div class="Boi-Blush Boi-Blush_R"></div>
        <div class="Boi-Eye Boi-Eye_L"></div>
        <div class="Boi-Eye Boi-Eye_R"></div>
        <div class="Boi-Mouth"></div>
      </figure>
      <a class="Confirm-Body-Button Confirm-Body-Button_Cancel" href="javascript: void(0)">Cancel</a>
      <a class="Confirm-Body-Button Confirm-Body-Button_Delete" href="javascript: void(0)">Uninstall</a>
    </div>
  </section>
</body>
<script>
  const confirm = document.querySelector('.Confirm');
  const boi = document.querySelector('.Boi');
  const btnDelete = document.querySelector('.Confirm-Body-Button_Delete');
  const btnCancel = document.querySelector('.Confirm-Body-Button_Cancel');
  const current = {
    happiness: 0.9,
    derp: 1,
    px: 0.5,
    py: 0.5
  };
  const target = {
    ...current
  };

  confirm.addEventListener('mousemove', onMouseMove);
  confirm.addEventListener('mouseleave', onMouseLeave);

  function onMouseMove({
    clientX: x,
    clientY: y
  }) {
    let dx1 = x - btnDelete.getBoundingClientRect().x - btnDelete.getBoundingClientRect().width * 0.5;
    let dy1 = y - btnDelete.getBoundingClientRect().y - btnDelete.getBoundingClientRect().height * 0.5;
    let dx2 = x - btnCancel.getBoundingClientRect().x - btnCancel.getBoundingClientRect().width * 0.5;
    let dy2 = y - btnCancel.getBoundingClientRect().y - btnCancel.getBoundingClientRect().height * 0.5;
    let px = (x - confirm.getBoundingClientRect().x) / confirm.getBoundingClientRect().width;
    let py = (y - confirm.getBoundingClientRect().y) / confirm.getBoundingClientRect().height;
    let distDelete = Math.sqrt(dx1 * dx1 + dy1 * dy1);
    let distCancel = Math.sqrt(dx2 * dx2 + dy2 * dy2);
    let happiness = Math.pow(distDelete / (distCancel + distDelete), 0.75);

    target.happiness = happiness;
    target.derp = 0;
    target.px = px;
    target.py = py;
  }

  function onMouseLeave() {
    target.happiness = 0.9;
    target.derp = 1;
    target.px = 0.5;
    target.py = 0.5;
  }

  function update() {
    for (let prop in target) {
      if (target[prop] === current[prop]) {
        continue;
      } else if (Math.abs(target[prop] - current[prop]) < 0.01) {
        current[prop] = target[prop];
      } else {
        current[prop] += (target[prop] - current[prop]) * 0.1;
      }
      boi.style.setProperty(`--${prop}`, current[prop]);
    }
    requestAnimationFrame(update);
  }
  update();
</script>

</html>